The Standard
ML Basis Library is a collection of modules providing a basic collection of
abstract types that are shared by all implementations of Standard ML. All of the
primitive types of Standard ML are defined in structures in the Standard Basis. It
also defines a variety of other commonly-used abstract types. Please see the Standard ML
Basis Libraryfor a complete description of the Standard Basis.

Most implementations of Standard ML include module libraries implementing a wide
variety of services. These libraries are usually not portable across
implementations, particularly not those that are concerned with the internals of the
compiler or its interaction with the host computer system. Please refer to the
documentation of your compiler for information on its libraries.